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If you were trying to get out of the way of a storm, you would need to know the speed at which it was moving.
An object in motion at a constant velocity will change its motion only if a balanced force acts on it.
The momentum of a 5,000-kg truck that is standing still is greater than the momentum of a 3,000-kg truck that is also at rest.
Madison is on a merry-go-round that is moving at a constant speed. Her velocity is also constant.
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